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ABCRTC(4) Device Drivers Manual ABCRTC(4)

abcrtcAbracon AB1805 real-time clock

abcrtc* at iic? addr 0x69

The abcrtc driver provides support for the Abracon AB1805 real-time clock chip and similar variants.

iic(4), intro(4)

The abcrtc driver first appeared in OpenBSD 6.5.

The abcrtc driver was written by Patrick Wildt <>.

December 23, 2023 OpenBSD-current